The Doctor and Jo discover The Master and the Ogrons are the masterminds behind the Galactic war between the Earth Federation and the Reptillian Draconian Empire and the Master has framed The Doctor and Jo as spies working for the Draconians. Only to discover The Master is also working with the Doctor's greatest enemies, The Daleks, who are also behind the galactic war.

The TARDIS lands on the jungle planet Spiridon, where the Doctor has fallen into a coma, where The Doctor has requested the Time Lords to pilot the TARDIS, so he and Jo can follow the Daleks to their base. Where Jo learns the Dalek's base has been located on Spiridon where the Daleks are attempting to discover the secrets of Invisibilty and create a bacterial virus in their goal of universal conquest. Where The Doctor, recovered from his coma and Jo are joined by a task-force of Thals and a native Spiridon named Wester, Where they not only set out to stop The Daleks ...